Critical severity9.8NVD Advisory· Published Jan 21, 2026· Updated Apr 15, 2026

CVE-2021-47854

Description

DD-WRT version 45723 contains a buffer overflow vulnerability in the UPNP network discovery service that allows remote attackers to potentially execute arbitrary code. Attackers can send crafted M-SEARCH packets with oversized UUID payloads to trigger buffer overflow conditions on the target device.

Patches

No patches discovered yet.

Vulnerability mechanics

AI mechanics synthesis has not run for this CVE yet.

References

dd-wrt.comnvd
download1.dd-wrt.com/dd-wrtv2/downloads/betas/2021/nvd
ssd-disclosure.com/ssd-advisory-dd-wrt-upnp-buffer-overflow/nvd
www.exploit-db.com/exploits/49730nvd
www.vulncheck.com/advisories/dd-wrt-upnp-buffer-overflownvd

News mentions

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